<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部提示 -->
      <el-alert :closable="false" show-icon title="注意:只允许为第三级分类设置相关参数" type="warning"> </el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择菜单 -->
          <el-cascader v-model="selectedCtaeKeys" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!-- tab区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加参数 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button @click="addDialogVisible = true" type="primary" :disabled="isBtnDisable">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环后台数据渲染tag标签 -->
                <el-tag @close="handleClosed(i, scope.row)" closable v-for="(item, i) in scope.row.attr_vals" :key="i">{{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button @click="removeParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加属性 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button @click="addDialogVisible = true" type="primary" :disabled="isBtnDisable">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环后台数据渲染tag标签 -->
                <el-tag @close="handleClosed(i, scope.row)" closable v-for="(item, i) in scope.row.attr_vals" :key="i">{{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button @click="showEditDialog(scope.row.attr_id)" size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button @click="removeParams(scope.row.attr_id)" size="mini" type="danger" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog @close="addDialogClosed" :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog @close="editDialogClosed" :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品列表
      catelist: [],
      //级联选择菜单的配置项
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
      },
      //   级联选择框v-modle
      selectedCtaeKeys: [],
      //被激活的tab名称
      activeName: 'many',
      //  动态数据
      manyTableData: [],
      //   静态数据
      onlyTableData: [],
      //   控制添加对话框显示与隐藏
      addDialogVisible: false,
      //   添加表单数据对象
      addForm: {},
      //   添加表单的验证规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }],
      },
      //   控制修改对话框显示与隐藏
      editDialogVisible: false,
      //   修改的表单数据对象
      editForm: {},
      //   修改表单的验证规则
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }],
      },
    }
  },
  created() {
    //   获取所有商品分类列表
    this.getCateList()
  },
  methods: {
    //   获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message, error('获取商品分类失败')
      this.catelist = res.data
    },
    // 级联选择框变化触发
    handleChange() {
      this.getParamsData()
      //   console.log(this.selectedCtaeKeys)
    },
    // tab点击事件函数
    handleTabClick() {
      this.getParamsData()
      //   console.log(this.activeName)
    },
    // 将请求列表参数单独封装一个函数
    // 在级联选择器发生变化和tab栏切换时都需要发起请求
    async getParamsData() {
      if (this.selectedCtaeKeys.length !== 3) {
        this.selectedCtaeKeys = []
        // 当分类级联选择器为空时清除参数列表
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      const { data: res } = await this.$http.get(`categories/${this.cateid}/attributes`, {
        params: { sel: this.activeName },
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
      // 循环得出参数的每一项attr_vals
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框显示与隐藏
        item.inputVisible = false
        // 文本框输入的值
        item.inputValue = ''
      })
      // 判断一下数据是属于哪个tab栏的数据
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateid}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加参数成功')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 点击按钮编辑
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(`categories/${this.cateid}/attributes/${id}`, {
        params: { attr_sel: this.activeName },
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听编辑对话框关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮修改参数
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateid}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) return this.$message.error('修改参数信息失败')
        this.$message.success('修改参数信息成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应参数项
    async removeParams(id) {
      const result = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      }).catch((err) => err)
      if (result !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateid}/attributes/${id}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败')
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点或按下enter触发
    async handleInputConfirm(row) {
      // console.log(111)
      // 去除文本框的无效空格后判断文本框输入的字符是否为空
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果不为空就执行后续操作
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.svaeAttrVals(row)
    },
    // 点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 当页面上元素重新渲染后会执行执行回调函数的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数
    handleClosed(i, row) {
      row.attr_vals.splice(i, 1)
      this.svaeAttrVals(row)
    },
    async svaeAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateid}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' '),
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数失败')
      this.$message.success('修改参数成功！')
    },
  },
  //   计算属性
  computed: {
    //   是否禁用按钮
    isBtnDisable() {
      if (this.selectedCtaeKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的id
    cateid() {
      if (this.selectedCtaeKeys.length === 3) {
        return this.selectedCtaeKeys[2]
      }
      return null
    },
    // 动态展示对话框标题文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 12px;
}
.input-new-tag {
  width: 120px;
}
</style>